The current alternates between DCEN and DCEP (Direct Current Electrode Positive), creating a balanced effect that solves the problems inherent in each individual mode. The metal’s high thermal conductivity demands the cleaning action of the electrode positive cycle to disrupt the oxide film.
Why AC TIG Struggles with Steel Penetration inefficiency
Workpiece Heating: The concentrated heat on the metal allows for deep, narrow penetration, ideal for butt joints and thick sections. A "Clean" setting extends the electrode positive time for maximum oxide removal, while a "Weld" setting extends electrode negative for deeper penetration.
For carbon steel and stainless steel, DCEN is the undisputed champion due to its superior penetration and smooth arc characteristics. Magnesium and its alloys also necessitate AC, though often at lower amperage settings than aluminum to prevent electrode erosion.
Why AC TIG Struggles with Steel Penetration Despite Its Cleaning Power
The Cleaning Stage (ACNE): During the ACEN phase (Electrode Positive), the intense heat on the workpiece strips away the refractory oxide layer, ensuring a clean weld puddle. The direction of electron flow determines how this energy is distributed.
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